126 lines
4.2 KiB
C#
126 lines
4.2 KiB
C#
#nullable enable
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using System;
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using System.Diagnostics.CodeAnalysis;
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namespace MediaBrowser.Common.Providers
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{
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/// <summary>
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/// Parsers for provider ids.
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/// </summary>
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public static class ProviderIdParsers
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{
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private const int ImdbMinNumbers = 7;
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private const int ImdbMaxNumbers = 8;
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private const string ImdbPrefix = "tt";
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/// <summary>
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/// Parses an IMDb id from a string.
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/// </summary>
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/// <param name="text">The text to parse.</param>
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/// <param name="imdbId">The parsed IMDb id.</param>
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/// <returns>True if parsing was successful, false otherwise.</returns>
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public static bool TryFindImdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> imdbId)
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{
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// imdb id is at least 9 chars (tt + 7 numbers)
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while (text.Length >= 2 + ImdbMinNumbers)
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{
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var ttPos = text.IndexOf(ImdbPrefix);
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if (ttPos == -1)
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{
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imdbId = default;
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return false;
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}
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text = text.Slice(ttPos);
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var i = 2;
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var limit = Math.Min(text.Length, ImdbMaxNumbers + 2);
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for (; i < limit; i++)
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{
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var c = text[i];
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if (!IsDigit(c))
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{
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break;
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}
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}
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// skip if more than 8 digits + 2 chars for tt
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if (i <= ImdbMaxNumbers + 2 && i >= ImdbMinNumbers + 2)
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{
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imdbId = text.Slice(0, i);
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return true;
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}
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text = text.Slice(i);
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}
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imdbId = default;
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return false;
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}
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/// <summary>
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/// Parses an TMDb id from a movie url.
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/// </summary>
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/// <param name="text">The text with the url to parse.</param>
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/// <param name="tmdbId">The parsed TMDb id.</param>
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/// <returns>True if parsing was successful, false otherwise.</returns>
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public static bool TryFindTmdbMovieId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> tmdbId)
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=> TryFindProviderId(text, "themoviedb.org/movie/", out tmdbId);
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/// <summary>
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/// Parses an TMDb id from a series url.
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/// </summary>
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/// <param name="text">The text with the url to parse.</param>
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/// <param name="tmdbId">The parsed TMDb id.</param>
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/// <returns>True if parsing was successful, false otherwise.</returns>
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public static bool TryFindTmdbSeriesId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> tmdbId)
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=> TryFindProviderId(text, "themoviedb.org/tv/", out tmdbId);
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/// <summary>
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/// Parses an TVDb id from a url.
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/// </summary>
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/// <param name="text">The text with the url to parse.</param>
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/// <param name="tvdbId">The parsed TVDb id.</param>
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/// <returns>True if parsing was successful, false otherwise.</returns>
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public static bool TryFindTvdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> tvdbId)
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=> TryFindProviderId(text, "thetvdb.com/?tab=series&id=", out tvdbId);
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private static bool TryFindProviderId(ReadOnlySpan<char> text, ReadOnlySpan<char> searchString, [NotNullWhen(true)] out ReadOnlySpan<char> providerId)
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{
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var searchPos = text.IndexOf(searchString);
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if (searchPos == -1)
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{
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providerId = default;
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return false;
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}
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text = text.Slice(searchPos + searchString.Length);
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int i = 0;
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for (; i < text.Length; i++)
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{
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var c = text[i];
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if (!IsDigit(c))
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{
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break;
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}
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}
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if (i >= 1)
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{
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providerId = text.Slice(0, i);
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return true;
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}
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providerId = default;
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return false;
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}
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private static bool IsDigit(char c)
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{
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return c >= '0' && c <= '9';
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}
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}
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}
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